java向集合中添加对象和取出对象的使用

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
class Student {
	String name;
	int age;
	public String getName() {
		return name;
	}
	public int getAge() {
		return age;
	}
	public Student(String name, int age) {
		this.name = name;
		this.age = age;
	}
}

public class Demo {
	public static void main(String[] args) {
		//1、创建4个学生对象
		Student stu1 = new Student("Tom", 10);
		Student stu2 = new Student("Aimee", 11);
		Student stu3 = new Student("George", 11);
		Student stu4 = new Student("Angelia", 13);
		//2、创建ArrayList集合对象并把4个学生放入其中
		List list = new ArrayList();
		list.add(stu1);
		list.add(stu2);
		list.add(stu3);
		list.add(2,stu4);//添加stu4到指定的位置
		//3、输出集合中学生的总数
		System.out.println("总共有学生"+list.size()+"个。");
		//4、通过遍历集合显示所有学生的信息
		for (int i = 0; i < list.size(); i++) { Student student=(Student)list.get(i); System.out.println(student.getName()+"\t"+student.getAge()); } } }